@quilted/react-testing
Advanced tools
@quilted/react-testingDocs are still a work in progress!
A library for testing React components with a focus on type safety and clear component boundaries.
$ yarn add @quilted/react-testing
This library supports testing React components in a number of different environments. The base @quilted/react-testing entry provides the testing API built on top of react-test-renderer. This version of the library can work with any React renderer, as the components are testable with just Node.
import {mount} from '@quilted/react-testing';
function PayNowButton({onPay}) {
return <button onClick={onPay}>Pay</button>;
}
const pay = () => {};
// "Mounts" our component, running all initial lifecycle events
const payNowButton = mount(<PayNowButton onPay={pay} />);
// Calls our pay() function
payNowButton.find('button').trigger('onClick');
The utilities show above work great for most React components. However, projects using react-dom can benefit from additional, DOM-related APIs by using the exports from @quilted/react-testing/dom instead. This library exposes an identical API to that of @quilted/react-testing, but adds additional properties and methods to the test objects to support more elegant assertions related to the actual DOM output of your components. These additional APIs are documented in the API section.
This version of the library mounts the components into the DOM. This means that you can test components that have DOM side effects. It also means that you must ensure the DOM globals are available, typically by using a test runner’s integration with libraries like jsdom).
import {mount} from '@quilted/react-testing/dom';
function PayNowButton({onPay}) {
return <button onClick={onPay}>Pay</button>;
}
const payNowButton = mount(<PayNowButton onPay={pay} />);
const expectedContent = payNowButton.html.includes('<button>Pay</button>');
This library also provides a @quilted/react-testing/preact entrypoint that can be used in Preact projects. It provides the same API (including the DOM additions) as @quilted/react-testing/dom, but uses all of Preact’s rendering and test utilities for the test environment.
import h from 'preact';
import {mount} from '@quilted/react-testing/preact';
function PayNowButton({onPay}) {
return <button onClick={onPay}>Pay</button>;
}
const payNowButton = mount(<PayNowButton onPay={pay} />);
const expectedContent = payNowButton.html.includes('<button>Pay</button>');
If your application prefers to reference react and alias it to preact/compat at build or test time, you can do the same in your tests by importing from @quilted/react-testing and aliasing the import to @quilted/react-testing/preact. The following configuration shows how you’d accomplish this using Jest’s moduleNameMapper option:
// jest.config.js
module.exports = {
// Rest of config...
moduleNameMapper: {
'^react$': 'preact/compat',
'^@quilted/react-testing$': '@quilted/react-testing/preact',
'^@quilted/react-testing/dom$': '@quilted/react-testing/preact',
},
};
A test using @quilted/react-testing tends to have the following structure:
mount your component with some props to get a "root" nodetriggerThe following example shows these steps in practice. This example uses jest as a test runner.
import {mount} from '@quilted/react-testing';
import ClickCounter from './ClickCounter';
describe('<ClickCounter />', () => {
it('triggers handlers', () => {
const clickCounter = mount(<ClickCounter defaultCount={0} />);
clickCounter.find('button').trigger('onClick');
clickCounter.find('button').trigger('onClick');
expect(clickCounter.text).toBe('count: 2');
});
});
This library ships with a few useful custom matchers for Jest. To include these matchers, import @quilted/react-testing/matchers in any file that is included as part of the setupFilesAfterEnv option passed to Jest.
import '@quilted/react-testing/matchers';
import {destroyAll} from '@quilted/react-testing';
afterEach(() => {
destroyAll();
});
This will allow you to use matchers such as toContainReactText or toContainReactComponent on your tree.
import {mount} from '@quilted/react-testing';
import ClickCounter from './ClickCounter';
import LinkComponent from './LinkComponent';
describe('<ClickCounter />', () => {
it('renders a link to a cool website', () => {
const clickCounter = mount(<ClickCounter defaultCount={0} />);
expect(wrapper).toContainReactComponent(LinkComponent, {
to: 'https://www.cool-website.com',
});
});
it('triggers handlers', () => {
const clickCounter = mount(<ClickCounter defaultCount={0} />);
clickCounter.find('button').trigger('onClick');
clickCounter.find('button').trigger('onClick');
expect(clickCounter).toContainReactText('count: 2');
});
});
Additionally, this library provides DOM-specific matchers, like toContainReactHtml, from the @quilted/react-testing/dom-matchers entrypoint.
import '@quilted/react-testing/matchers';
import '@quilted/react-testing/dom-matchers';
// In a test...
const button = mount(<Button>Hello!</Button>);
expect(button).toContainReactHtml('<button>Hello!</button>');
mount(element: ReactElement<any>)Mounts a component to the DOM and returns a Root instance. Note that for this to work, you must have a simulated browser environment, such as the jsdom environment that Jest uses.
createMount<MountOptions, Context, Actions, Async>(options: CreateMountOptions<MountOptions, Context, Actions, Async>): MountFunctionThe mount function is powerful on its own, but applications will often want a more powerful version tailored to their application. A common example is app-wide context, where a set of context providers are generally assumed to be present for every component under test.
createMount enables this kind of customization by vending a custom mount function that will automatically wrap the component under test in an appropriate test wrapper. This custom mount function can do four things:
MountOptions genericcontext (be it objects passed through react context providers, or other useful values for controlling the test harness), and another object for helpful test actionsThese features are controlled by the generic type arguments to createMount, and the options detailed in the section below. Note that, no matter how many context providers or test wrapper you end up rendering your element within, all of the methods on the returned Root instance will still be scoped to within the tree actually under test.
context(options: MountOptions): ContextTakes an object of options passed by a user of your custom mount (or an empty object), and should return an object containing the context you need for the test harness. If your Context type has non-optional keys, you must provide this option.
render(element: ReactElement, context: Context, options: MountOptions): ReactElementThis function is called with the react element under test, the context created by context() (or an empty object), and the options passed by the user of your custom mount (or an empty object). This function must return a new react element, usually by wrapping the component in context providers.
Note:
rendercan be called multiple times for a given component. Yourrenderfunction (and any wrapping elements you put around the element under test) should be able to re-render from calling this function, ideally without unmounting the component under test.
actions(root: CustomRoot, options: MountOptions): ActionsTakes the root node of the tree and any mount options that were provided, and returns an object with any helpers that you need for the test harness.
If your Action type has non-optional keys, you must provide this option.
afterMount(root: CustomRoot, options: MountOptions): Promise | voidThis function allows you to perform additional logic after a component has been mounted. It gets called with a special Root instance that has one additional property: context, the object with the context you created in context() (or an empty object). You can use this hook to perform some additional resolution after the component has mounted, such as resolving all GraphQL.
If this option returns a Promise, the result of calling mount() will become a promise that resolves to the custom Root instance. Otherwise, it will synchronously return the Root instance. If you specify the Async generic argument as true, you must pass this option.
It is possible to extend a custom mount function with additional logic. This can help to provide more focused testing utilities for a section of the application that provides additional context to its subtree. Every function created by createMount has an extend method. This method has the same type parameters and options as createMount itself. When you create an extended mount function, your additional options are merged with the original mount’s options as follows:
mount function accepts the merged set of allowed options.mount function has a context property that is the merged result of calling the original context and the extended context.context() and render() options you provide to mount.extend() will be called with the full, merged set of options.render() option provided to mount.extend() is called first. The result of calling this function is then passed to the original render().afterMount() option provided to mount.extend() is called first. If it returns a promise, the resulting post-mount process will wait for it to resolve, and will then return the result of calling the original afterMount(). If either the original options or the extended options return a promise from afterMount, the resulting mount function will be asynchronous.Additionally, a new option is available for extend(): you can provide an options callback that receives as an argument the merged set of options, and must return a partial subset of those options to use as overrides. This can be used to extend a mount function and provide default values for some options that do not otherwise have defaults, or to customize base options on the basis of your newly-added options.
import {createMount} from '@quilted/react-testing';
interface Options {
pathname: string;
}
interface ExtendedOptions {
graphQLResult: object;
}
const mount = createMount<Options, Options>({
context: (options) => options,
render: (element, {pathname}) => (
<Router pathname={pathname}>{element}</Router>
),
});
const extendedMount = mount.extend<ExtendedOptions, ExtendedOptions>({
context: (options) => options,
render: (element, {graphQLResult}) => (
<GraphQLMock mock={graphQLResult}>{element}</GraphQLMock>
),
});
const mounted = extendedMount(<MyComponent />, {
pathname: '/',
graphQLResult: {},
});
// The final structure of this wrapper is:
// <Router><GraphQLMock><MyComponent /></GraphQLMock></Router>
//
// It also has a context field that merged the two `context()`
// results: typeof mounted.context === {pathname: string; graphQLResult: object}
mount.hook<HookResult>(useHook: HookResult, options?: MountOptions): HookRunner<HookResult, Context, Actions>Whenever possible, you should use test on component boundaries using mount() and the Root and Node objects it creates. Sometimes, you might have a particularly complex bit of logic that you encapsulate in a custom hook. Every mount(), including custom mount functions, provide a hook() method to run your hook in a simulated component, and to access the current return result of your hook. Below, you can see how we can use this helper to inspect our custom hook’s initial result:
import {useState} from 'react';
import {mount} from '@quilted/react-testing';
function useIncrementingNumber(initial: number) {
const [currentNumber, setCurrentNumber] = useState(initial);
const incrementNumber = () => setCurrentNumber((current) => current + 1);
return [currentNumber, incrementNumber];
}
const incrementingNumber = mount.hook(() => useIncrementingNumber(5));
incrementingNumber.value[0]; // Our initial number, `5` in this case
The returned “hook runner” can do more than just give you access to the hook’s result. You can also simulate actions that use the hook’s result using the act() method. After calling act(), the value property will be updated with the most recent result.
const incrementingNumber = mount.hook(() => useIncrementingNumber(5));
incrementingNumber.act(([currentNumber, incrementNumber]) => {
incrementNumber();
});
incrementingNumber.value[1]; // It’s `6` now!
If the “base” mount you used was created using createMount(), the second argument to its hook() method can be any options you could pass as the second argument to mount() itself. The resulting hook runner will also have the same context and actions properties as a mounted component would have. If the base mount is asynchronous, hook() is asynchronous as well.
destroyAll()All mounted components are tracked in-memory. destroyAll() forcibly unmounts all mounted components and removes the DOM node used to house them. You should run this after each test that mounts a component (this is often done in a global afterEach hook).
Root<Props>A Root object represents a mounted react tree. Most of the properties and methods it exposes are simply forwarded to the Node instance representing the top-level component you rendered:
This object also has a number of methods that only apply to the root of a component tree:
mount()Re-mounts the component to the DOM. If the component is already mounted, this method will throw an error.
unmount()Unmounts the component from the DOM. If the component is not already mounted, this method will throw an error. This method can be useful for testing side effects that occur in componentWillUnmount or useEffect hooks.
setProps(props: Partial<Props>)Allows you to change a subset of the props specified when the component was originally mounted. This can be useful to test behaviour that is only caused by a change in props, such as getDerivedStateFromProps or its equivalent useRef/ useState hook version.
act<T>(action: () => T): TPerforms an action in the context of a react act() block, then updates the internal representation of the react tree. You must use this whenever performing an action that will cause the react tree to set state and re-render, such as simulating event listeners being called. Failing to do so will print a warning, and the react tree will not be updated for subsequent calls to methods such as find().
function MyComponent() {
const [clicked, setClicked] = useState(false);
useEffect(
() => {
const handler = () => setClicked(true);
document.body.addEventListener('click', handler);
return () => document.body.removeEventListener('click', handler);
},
[setClicked],
);
return clicked ? <div>I’ve been clicked!</div> : <div>Nothing yet</div>;
}
const myComponent = mount(<MyComponent />);
// If you don’t do this, you’ll see a warning and the subsequent assertion
// will fail
myComponent.act(() => simulateClickOnBody());
expect(myComponent.text()).toContain been clicked!');
destroy()Unmounts the component and removes its associated DOM node. This method ensures that nothing leaks between tests. It is called on all un-destroyed Root objects when you call destroyAll()
forceUpdate()Forces the root component to re-render. This can be necessary in some cases where globals change in a way that does not already cause a "natural" react update, but in general, this method should not be necessary.
Node<Props>The Node object represents a react element in the tree. This element can be a DOM node, custom react component, or one of the many "special" types react creates, such as context providers and consumers. The Node object also houses all of the methods that you will use to find rendered subcomponents (find and friends), get your react tree into the desired state (trigger), and ensure that state is correct (props).
It is important to understand that the Node object is only a snapshot representation of the react tree at one point in time. As soon as you use trigger to simulate calling a prop, or Root#act to commit an arbitrary update, the Node should be considered "stale" and discarded.
props: PropsThis getter returns the props for the component.
type: anyThis getter returns the type of component. For DOM nodes, this will be a string representing the rendered DOM element. For custom react components, this will be the react component itself. For all other nodes, this will be null.
isDOM: booleanOnly available from
@quilted/react-testing/domor@quilted/react-testing/preact
This getter returns whether the node represents a DOM node.
instance: anyThis getter returns the instance associated with the component. Note: this property technically gives you access to fields like state and methods like setState, but doing so violates component boundaries and makes for bad tests. If you can avoid it, you should never use this getter. It should be seen only as an escape hatch when it is impossible to perform the update you need with props alone.
children: Node<unknown>[]This getter returns an array of the component’s rendered children (Nodes and strings).
descendants: Node<unknown>[]This getter returns an array of Nodes or strings that represent everything below this component in the React tree.
domNodes: HTMLNode[]Only available from
@quilted/react-testing/domor@quilted/react-testing/preact
Returns all DOM nodes that are directly rendered by this component (that is, not rendered by descendant components).
domNode: HTMLNode | nullOnly available from
@quilted/react-testing/domor@quilted/react-testing/preact
Like domNodes, but expects only 1 or 0 DOM nodes to be direct children. If more than 1 DOM node is a child, this method throws an error. If no DOM nodes are children, this method returns null.
prop<K extends keyof Props>(key: K): Props[K]Returns the current value of the passed prop.
function MyComponent({name}: {name: string}) {
return <div>Hello, {name}!</div>;
}
function Wrapper() {
return <MyComponent name="Michelle" />;
}
const wrapper = mount(<Wrapper />);
expect(wrapper.find(MyComponent).prop('name')).toBe('Michelle');
// Will give you a type error
expect(wrapper.find(MyComponent).prop('firstName')).toBe('Uhh');
text: stringReturns the text content of the component. In the default @quilted/react-testing version of the library, this is the result of concatenating together all React text elements in the tree. In the DOM testing libraries, this is the string of text you would receive from mapping over each DOM node rendered as a descendant of this component and taking its textContent.
html: stringOnly available from
@quilted/react-testing/domor@quilted/react-testing/preact
Returns the HTML content of the component. This is the string of text you would receive from mapping over each DOM node rendered as a descendant of this component and taking its innerHTML.
is(type: Type): this is Node<PropsForComponent<Type>>Returns a boolean indicating whether the component type matches the passed type. This function also serves as a type guard, so subsequent calls to values like props will be typed as the prop type of the passed component.
function MyComponent({name}: {name: string}) {
return <div>Hello, {name}!</div>;
}
function isMatch(element: Node<unknown>) {
// If we omitted element.is here, we would not know whether 'name' was a prop,
// so we would get a type error.
return element.is(MyComponent) && element.prop('name') === 'Chris';
}
find(type: Type, props?: Partial<PropsForComponent<Type>>): Node<PropsForComponent<Type>> | nullFinds a descendant component that matches type, where type is either a string or react component. If no matching element is found, null is returned. If a match is found, the returned Node will have the correct prop typing, which provides excellent type safety while navigating the react tree.
function MyComponent({name}: {name: string}) {
return <div>Hello, {name}!</div>;
}
function YourComponent() {
return <div>Goodbye, friend!</div>;
}
function Wrapper() {
return <MyComponent name="Michelle" />;
}
const wrapper = mount(<Wrapper />);
expect(wrapper.find(MyComponent)).not.toBeNull();
expect(wrapper.find(YourComponent)).toBe(null);
You can optionally pass a second argument to this function, which is a set of props that will be used to further filter the matching elements. These props will be shallow compared to the props of each element.
function MyComponent({name}: {name: string}) {
return <div>Hello, {name}!</div>;
}
function YourComponent() {
return <div>Goodbye, friend!</div>;
}
function Wrapper() {
return (
<>
<MyComponent name="Michelle" />
<MyComponent name="Gord" />
</>
);
}
const wrapper = mount(<Wrapper />);
expect(wrapper.find(MyComponent, {name: 'Gord'})!.props).toMatchObject({
name: 'Gord',
});
findAll(type: Type, props?: Partial<PropsForComponent<Type>>): Node<PropsForComponent<Type>>[]Like find(), but returns all matches as an array.
findWhere(predicate: (element: Node<unknown>) => boolean): Node<unknown> | nullFinds the first descendant component matching the passed function. The function is called with each Node from descendants until a match is found. If no match is found, null is returned.
findAllWhere(predicate: (element: Node<unknown>) => boolean): Node<unknown>[]Like findWhere, but returns all matches as an array.
findContext(context: Context<Type>): Type | undefinedFinds the value of the first descendant provider for the pass context. If no matching context is found, undefined is returned.
Most tests looking for context are probably better served by using the .toProvideReactContext matcher. However, it is sometimes useful to grab the context value directly. In particular, if your context object is "smart" — that is, it has methods, and is not just data — you may want to grab the context object to call its functions.
const AuthContext = createContext<{logout(): void} | null>(null);
const auth = {
logout() {
/* log out! */
},
};
function MyComponent({children}) {
return <AuthContext.Provider value={auth}>{children}</AuthContext.Provider>;
}
const myComponent = mount(<MyComponent />);
myComponent.findContext(AuthContext)!.logout();
/* expect some outcomes from having called .logout() */
Note that, if your context provider can provide undefined, getting undefined back from this function doesn't mean that no context providers were found; to determine the presence of any context providers, you can use `.find(Context.Provider) instead.
trigger<K extends FunctionKeys<Props>>(prop: K, ...args: Arguments<Props<K>>): ReturnType<Props<K>>Simulates a function prop being called on your component. This is usually the key to effective tests: after you have mounted your component, you simulate a change in a subcomponent, and assert that the resulting react tree is in the expected shape. This method automatically uses Root#act when calling the prop, so updates will automatically be applied to the root component.
When you pass a key that is a prop on your component with a function type, this function will ensure that you pass arguments that are deeply partial versions of the types the prop expects. This allows you to, for example, pass an event object with only a few properties set to a button’s onClick prop. trigger returns whatever the result was of calling the prop.
import {useState} from 'react';
function MyComponent({onClick}: {onClick(id: string): void}) {
return (
<button type="button" onClick={() => onClick(String(Math.random()))}>
Click me!
</button>
);
}
function Wrapper() {
const [id, setId] = useState('');
return (
<>
<MyComponent onClick={setId} />
<div>Current id is: {id}</div>
</>
);
}
const wrapper = mount(<Wrapper />);
wrapper.find(MyComponent)!.trigger('onClick', 'some-id');
expect(wrapper.find('div')!.text()).toContain('some-id');
triggerKeypath<T>(keypath: string, ...args: any[]): TLike trigger(), but allows you to provide a keypath referencing nested objects instead. Note that limitations in TypeScript prevent the same kind of type-safety as trigger guarantees.
function MyComponent({action}: {action: {onAction(): void; label: string}}) {
return (
<button type="button" onClick={action.onAction}>
{action.label}
</button>
);
}
const spy = jest.fn();
const myComponent = mount(
<MyComponent action={{label: 'Hi', onAction: spy}} />,
);
myComponent.triggerKeypath('action.onAction');
expect(spy).toHaveBeenCalled();
debug(options?: {allProps?: boolean, depth?: number, verbosity?: number}): stringReturns a text representation of either the root node, or any element within the mounted graph. debug() output can be tweaked using the options parameter.
allProps overrides the default props filtering behaviour and instead includes all props in the output, by default className, aria-*, and data-* props are omitted.depth defines the number of children printed, by default all children are printed.verbosity defines the level of expansion that non-scalar props experience, the default value of 1 will expand objects one level deepTypical usage should not require providing any options as the default verbosity and depth should be appropriate for the majority of inspections.
function ObjectText({data}: {data: {}}) {
return <span>{JSON.stringify(data)}</span>;
}
function Container({children}: PropsWithChildren<{}>) {
return children;
}
function MyComponent({onClick}: {onClick(id: string): void}) {
return (
<Container>
<button type="button" onClick={() => onClick(String(Math.random()))}>
<ObjectText data={{a: {very: {deep: {data: {object: 'with text'}}}}}} />
</button>
</Container>
);
}
const wrapper = mount(<MyComponent />);
// print the whole structure with one level of prop verbosity
console.log(wrapper.debug());
// print only the Container and button without any other children
console.log(wrapper.find(Container)!.debug({depth: 1}));
// find button by name and print all children with verbose props details
console.log(
wrapper
.findWhere((type) => type && type.name === 'button')!
.debug({verbosity: 9}),
);
.toHaveReactProps(props: object)Checks whether a Root or Node object has specified props (asymmetric matchers like expect.objectContaining are fully supported). Strict type checking is enforced, so the props you pass must be a valid subset of the actual props for the component.
const myComponent = mount(<MyComponent />);
expect(myComponent.find('div')).toHaveReactProps({'aria-label': 'Hello world'});
expect(myComponent.find('div')).toHaveReactProps({
onClick: expect.any(Function),
});
.toHaveReactDataProps(data: object)Only available from
@quilted/react-testing/dom-matchers
Like .toHaveReactProps(), but is not strictly typed. This makes it more suitable for asserting on data- attributes, which can’t be strongly typed.
const myComponent = mount(<MyComponent />);
expect(myComponent.find('div')).toHaveReactDataProps({
'data-message': 'Hello world',
});
.toContainReactComponent(type: string | ComponentType, props?: object)Asserts that at least one component matching type is in the descendants of the passed node. If the second argument is passed, this expectation will further filter the matches by components whose props are equal to the passed object (again, asymmetric matchers are fully supported).
const myComponent = mount(<MyComponent />);
expect(myComponent).toContainReactComponent('div', {
'aria-label': 'Hello world',
onClick: expect.any(Function),
});
.toContainReactComponentTimes(type: string | ComponentType, times: number, props?: object)Asserts that a component matching type is in the descendants of the passed node a number of times. If the third argument is passed, this expectation will further filter the matches by components whose props are equal to the passed object (again, asymmetric matchers are fully supported). To assert that one component is or is not the descendant of the passed node use .toContainReactComponent or .not.toContainReactComponent.
const myComponent = mount(<MyComponent />);
expect(myComponent).toContainReactComponentTimes('div', 5, {
'aria-label': 'Hello world',
});
.toProvideReactContext<T>(context: Context<T>, value?: T)Asserts that at least one context.Provider is in the descendants of the passed node. If the second argument is passed, this expectation will further filter the matches by providers whose value is equal to the passed object (again, asymmetric matchers are fully supported).
import {createContext} from 'react';
const MyContext = createContext({hello: 'world'});
function MyComponent({children}) {
return (
<MyContext.Provider value={{hello: 'Winston!'}}>
{children}
</MyContext.Provider>
);
}
const myComponent = mount(<MyComponent />);
expect(myComponent).toProvideReactContext(MyContext, {
hello: expect.any(String),
});
.toContainReactText(text: string)Asserts that the rendered output of the component contains the passed string as text content (that is, the text is included in what you would get by calling textContent on all root DOM nodes rendered by the component).
const myComponent = mount(<MyComponent />);
expect(myComponent).toContainReactText('Hello world!');
.toContainHtml(text: string)Only available from
@quilted/react-testing/dom-matchers
Asserts that the rendered output of the component contains the passed string as HTML (that is, the text is included in what you would get by calling outerHTML on all root DOM nodes rendered by the component).
const myComponent = mount(<MyComponent />);
expect(myComponent).toContainHtml('<span>Hello world!</span>');
Enzyme is a very popular testing library that heavily inspired the approach this library takes. However, our experience with Enzyme has not been ideal:
setState which encourage reaching in to implementation details of your components.trigger().While the premise of writing tests that mirror user actions is compelling, basing all tests off the raw DOM being produced becomes unmanageable for larger apps.
We currently provide support for Preact applications via a separate package. This may change in the future.
FAQs
> Docs are still a work in progress!
We found that @quilted/react-testing demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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